Gage.



G. J. WALKER.

GAGE.

APPLICATION FILED APR. 18. I917.

Patented Jan. 8, 1918.

" GLEN J'. WALKER, OE DETROIT, MICHIGAN,

CORPORATION, 'OF DETROIT, MICHIGAN,

ASSIGNOR TO CONTINENTAL MOTORS A CORPORATION OF VIRGINIA.

GAGE.

Specification of Letters Patent.

Patented Jan. 8, 1918.

Application filed April 18, 1917. Serial No. 162,821.

To all whom it may concern:

Be it known that I, GLEN J. WALKER, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented cer- 'tain new and useful Improvements in Gages, of which the following is a specification, re erence being had therein to the accompanying drawings.

During the manufacture of engine cylinders particularly in large quantities, as in modern gas engines and automobile plants and like bodies, it is necessary in order to maintain uniformity and accessory of product, to test the bores thereof from time to time.

This invention relates to a gage for testing the bores'of cylinders or the like and to an arrangement thereof whereby the tool is readily manipulated and whereby any variations in diameter from end to end of the cylinder or like irregularities are quickly and easily noted,

The invention consists in the matters here-. inafter set forth, and more particularly pointed out in the appended claims.

In the drawings,

Figure 1 is a plan view with the handle shown in section, of a gage that embodies features of the invention;

Fig. 2 is a view, partially in longitudinal section and partially in elevation, of the device; y

Fig. 3 is a view in side elevation of the device;

Fig. 4 is a bottom view of the device; Iiig. 5 is a view in detail of a guide bar, ant

Fig. 6 is a view, greatly reduced'and in elevation, of the device with a bearing plate thereon.

As herein indicated, a tubular shell 1, that is preferably cast of aluminum or like light material and of a design to insure strength with lightness. has longitudinal grooves in its periphery in which yieldingly projected.

guide bars 2 aredisposed symmetrically and oppositely to a bearing plate 3 that is detachably secured on a flat face 4 of the body. In preferred form, the guide bars 2 have stems 5 extending through rabbeted iide apertures, with check nuts 6 on one side and springs 7 seated in the recesses to yieldin'gly project thebars on the other side.

The bearing plate 3 has cylindrically concylinder and turned vex faces 8 the diameter of which is approximately the diameter of the particular cylinders to be gaged.,bearing plates for different diametersof cylinders being provided with the instrument.

A transverse wall 9 in the casing 1 has a bearing surface 10 on which a suitable direct reading gage 10 is secured by any suitable means so thereof is substantially opposite diametrically to the bearing plate, and is arranged to project through a suitable opening in the casing wall. While this gage may be of any type it is preferably one having a dial face '12 swept by an index hand 13 the whole being visible from the upper end of the shell as the gage is dropped into an upright cylinder.

For ease of manipulation a bail handle 14 is mounted by suitable pintles 15 or the lige within the shell so that the latter can e raised and lowered in a cylinder that it is desired to test.

In operation, the cylinder to be tested may be placed on end and the gage thrust into it so that the yielding shoes hold the bearing plate firmly in contact with the cylinder wall which is thus traversed by the test finger of the dial gage. If the instrument is shifted from end to end of the as it is moved, any variations are promptly noted and the extent thereof indicated by the gage. larly, rotation at different points and like manipulations afford means for determining other irregularities. Ifthe gage is first set by a master ring, it then shows any deviation from the desired diameter.

Obviously, changes in the details of construction may be made without departing from the spirit of my invention andI do not care to limit myself to any particular form or arrangement of parts. \Vhat I claim as my invention is I 1. An instrument for testing cylindrical bores comprising a cylinder shell provided with a detachable and interchangeable guide plate of fixed externalcurvature, guide shoes yieldingly projected from the shell opposite to the attached mounted in the shell and provided with a testing finger extending through an opening thereof opposite to the bearing plate.

2. An instrument for testing cylindrical bores comprising a shell provided with. pe-

Sim1- guide plate and a gage *riphera l guide grooves, a detachable bearing 4 plate mounted on the periphery of the shell and provided with a cylindrical convex bear in surface, guide shoes yieldingly recipro ca le in the guidegrooves in the shell and a testing gage in the shell provided with a testing finger yieldin'gly projected through shell provlded with peripheral guide grooves,

with the indexface of the a bearing plate secured thereon and provided with convex bearing surfaces of greater diameter than the diameter of the shell, a'pair of guide shoes yieldingly projected from the guide grooves in the shell opposite the bearing plate and a testing gage mounted in the shell and provided with a testing finger extending through an opening in the shell opposite the bearing plate and gage visible through the shell end.

4. A testing gage for cylindrical bores comprising a substantially cylindrical shellprovided with peripheral guide grooves, a bearing plate detachably mounted on the shell and provided with cylindrical convex bearing-surfaces of greater radii than the radius of the shell, guide shoes plying in the longitudinal grooves in the shell symmetrically opposite to the bearing plate, means for yieldingly projecting the guide shoes from the slots and testing gage secured within the shell with the dial thereof visible through theshell end and provided with an index finger yieldingly' extending through :1? opening in the shell opposite the bearing p ate.

In testimony-whereof I affix my signature in the presence of two witnesses.

GLEN J. WALKER. Witnesses:

R031. A. WEINHARDT, WILLIAM R. ANGELL. 

